Retirement Plan - Components of Net Pension Expense and Periodic Benefit Costs (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 29, 2013	Dec. 30, 2012
Compensation and Retirement Disclosure [Abstract]
Expected return on assets	$ (1,333)	$ (1,175)
Service cost	1,036	1,222
Interest cost	1,257	1,120
Amortization of prior service cost	1	1
Amortization of recognized losses	298	747
Net pension expense	$ 1,259	$ 1,915